If memory serves, according to the Shooting Times magazine review of that gun, the magazine is a bit short and will therefore prevent the use of (long) 300 grain (or more) bullets.

That was a couple of years ago when the gun was first introduced. Ruger may have addressed this problem. Dunno...

I had a blued version, but sold it before I had the chance to shoot it. To me it seemed like a nice & trim brush gun.